|Publication number||US7484802 B2|
|Application number||US 12/079,053|
|Publication date||Feb 3, 2009|
|Filing date||Mar 24, 2008|
|Priority date||Mar 1, 2005|
|Also published as||CA2600312A1, CA2600312C, CA2829902A1, CA2829902C, CA2850677A1, CA2850677C, CN101208031A, CN101208031B, CN103494465A, CN103494465B, EP1855569A2, US7347495, US8313143, US8845024, US20070057550, US20080179929, US20090256407, US20120274119, US20150015052, WO2006094261A2, WO2006094261A3|
|Publication number||079053, 12079053, US 7484802 B2, US 7484802B2, US-B2-7484802, US7484802 B2, US7484802B2|
|Inventors||Pete J. Beyer, Joe Willette, Larry A. Wilkerson, Teresa Bellingar|
|Original Assignee||Haworth, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (92), Non-Patent Citations (1), Referenced by (27), Classifications (7), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of U.S. Ser. No. 11/598,164, filed Nov. 10, 2006, now U.S. Pat.No. 7,347,495which is a continuation of PCT Application No. PCT/US06/07822, filed Mar. 1, 2006, which claims the benefit of U.S. Provisional Application No. 60/657,312, filed Mar. 1, 2005.
The invention relates to an office chair and more particularly, to an office chair having lumbar and pelvic supports to support the back of the chair occupant.
Preferably, conventional office chairs are designed to provide significant levels of comfort and adjustability. Such chairs typically include a base which supports a tilt control mechanism to which a seat assembly and back assembly are movably interconnected. The tilt control mechanism includes a back upright which extends rearwardly and upwardly and supports the back assembly rearwardly adjacent to the seat assembly. The tilt control mechanism serves to interconnect the seat and back assembly so that they may tilt rearwardly together in response to movements by the chair occupant, and possibly to permit limited forward tilting of the seat and back. Further, such chairs typically permit the back to also move relative to the seat during such rearward tilting.
The chair also is designed to provide additional support assemblies to provide further support to the occupant's body at various locations thereof. In this regard, support assemblies have been provided which attempt to provide adjustable support to the lower back of the user in the lumber region thereof. However, one difficulty associated with the design of conventional office chairs is the fact that office workers have different physical characteristics and comfort preferences such that it is difficult to design a single chair configuration that satisfies the preferences of the different individuals who might purchase such a chair.
To improve comfort, it is known to provide lumbar supports which allow for adjustment of the elevation of the lumbar support along the back of the user. However, often times, such lumbar supports may be found uncomfortable to various individuals since they tend to provide localized pressure on the lumbar region of the back.
Accordingly, it is an object of the invention to overcome disadvantages associated with prior lumbar support arrangements.
The invention relates to a chair having an improved back assembly which provides support to the lumbar region of the chair occupant as well as to the pelvic region thereof. The back assembly of the invention includes a lumbar support arrangement disposed in the lumbar region of the back which is adjustable vertically to accommodate different sizes of chair users. Also, a pelvic support unit, i.e. pusher, may be provided vertically below the lumbar support to gently press upon the back of the user in the pelvic region thereof.
The back assembly is of the type having an open annular frame with a suspension fabric extending therebetween to close the central opening of the back frame. Since this suspension fabric is only a thin layer of material, the support provided by the lumbar support assembly is more readily felt and it is more critical to provide a comfortable lumbar support pad.
In an effort to provide optimum support to the back of the chair occupant, the lumbar support pad itself is formed of concentric support rings wherein radially adjacent pairs of such rings are flexibly joined together by connector webs extending therebetween. To a certain extent, each ring can independently move relative to an adjacent ring such that an outer ring would first contact an occupant and a next linear ring would then successively support the occupant as the occupant deflects the pad. This allows for greater variations in pressure being applied by each ring to the back of the user. Further, the lumbar support pad more readily adjusts to the shape of the occupant's back if the occupant presses sufficiently against the pad. The lumbar support thereby provides a desired amount of support while maintaining a proper ergonomic posture which does not depend upon movement of a lumbar pad toward or away from an occupant as in some prior art lumbar supports.
Additionally, the lumbar support pad is carried by a support arm formed similar to a leaf spring wherein the support arm has a vertically elongate opening in the middle thereof to separate the left and right halves of the support arm from each other along a substantial portion of the length of each support arm. While the support arm may bend rearwardly in response to the occupant, the bending point or fulcrum point for each of the left and right arm halves is independently adjustable so that the support provided to the lumbar support pad is asymmetric with respect to the left and right halves of the support pad. This support arm provides asymmetric support to the lumbar support pad and each half thereof may move more independently of the other in response to different loads or if remaining stationary, generate variable, asymmetric counter-pressure to the occupant which resists movement of the pad. The lumbar support arm provides varying rates of support for a given amount of deflection by repositioning the fulcrum point. The asymmetric support of the lumbar is adjustable by a pair of adjustment cranks which rotate independently of each other to adjust the fulcrum point of the respective arm halves without requiring or causing displacement of the pad. The chair occupant therefore can more accurately adjust the support provided by the support pad asymmetrically wherein it has been found that this asymmetric support provides improved comfort to the chair occupant.
Additionally, the pelvic support is provided vertically adjacent to the lumbar support to provide support to the different regions of the occupant's back. As described in further detail herein, the foregoing arrangement of a back assembly provides a more comfortable system for supporting the occupant's back.
Other objects and purposes of the invention, and variations thereof, will be apparent upon reading the following specification and inspecting the accompanying drawings.
Certain terminology will be used in the following description for convenience and reference only, and will not be limiting. For example, the words “upwardly”, “downwardly”, “rightwardly” and “leftwardly” will refer to directions in the drawings to which reference is made. The words “inwardly” and “outwardly” will refer to directions toward and away from, respectively, the geometric center of the arrangement and designated parts thereof. Said terminology will include the words specifically mentioned, derivatives thereof, and words of similar import.
Generally, this chair 10 includes improved height-adjustable arm assemblies 12 which are readily adjustable. The structure of each arm assembly 12 is disclosed in U.S. Provisional Patent Application Ser. No. 60/657,632, filed Mar. 1, 2005, entitled ARM ASSEMBLY FOR A CHAIR, which is owned by Haworth, Inc., the common assignee of this present invention. The disclosure of this patent application is incorporated herein in its entirety by reference.
The chair 10 is supported on a base 13 having radiating legs 14 which are supported on the floor by casters 15. The base 13 further includes an upright pedestal 16 which projects vertically and supports a tilt control mechanism 18 on the upper end thereof. The pedestal 16 has a pneumatic cylinder therein which permits adjustment of the height or elevation of the tilt control mechanism 18 relative to a floor.
The tilt control mechanism 18 includes a control body 19 on which a pair of generally L-shaped uprights 20 are pivotally supported by their front ends. The uprights 20 converge rearwardly together to define a connector hub 22 (
The back assembly 24 has a suspension fabric 25 supported about its periphery on the corresponding periphery of the frame 23 to define a suspension surface 26 against which the back of a chair occupant is supported. The structure of the back assembly 24 is disclosed in U.S. Provisional Patent Application Ser. No. 60/657,313, filed Mar. 1, 2005, entitled CHAIR BACK, which is owned by Haworth, Inc. The disclosure of this patent application is incorporated herein in its entirety by reference.
To provide additional support to the occupant, the back assembly 24 includes a lumbar support unit 28 which is configured to support the lumbar region of the occupant's back and is adjustable to improve the comfort of this support. Also, the back assembly 24 is provided with a pelvic support unit 29 disposed rearwardly of the pelvic region of the chair occupant.
Additionally, the chair 10 includes a seat assembly 30 that defines an upward facing support surface 31 on which the seat of the occupant is supported.
Turning first to the back assembly 24 which supports the lumbar support unit 28 and the pelvic support unit 29, the back assembly 24 is generally illustrated in
As can be seen in
To support the occupant, the back assembly 24 includes the suspension fabric 25 which is secured taughtly on the frame. Specifically, the back frame 23 includes a peripheral spline channel 42 (
Referring further to
The lower end of the support column 44 includes a generally L-shaped connector flange 46 (
Referring more particularly to the components of the back assembly 24,
The rear frame unit 55 comprises the support structure 43 and the rear frame ring 56, wherein the support structure 43 and the rear frame ring 56 are molded simultaneously together in a one-piece monolithic construction having the contoured shape described above. To facilitate molding of this contoured shape while still possessing the spline channel 42 mentioned above, the rear frame ring 56 and front frame ring 57 are molded separate from each other and then affixed together.
Turning to the support structure 43, the support column 44 thereof is located centrally within the lower half of the central frame opening 40. The support column 44 has a base end 59 and a pair of column halves 60 and 61 which are separated from each other by a vertically elongate column slot 62. The column 44 therefore is formed as a split column by the slot 62 which extends along a substantial portion of the length of the column 44 with the column halves 60 and 61 being formed as one piece along with the base section 59. As such, the column halves 60 and 61 are supported in cantilevered relation by the base section 59.
The rear frame unit 55 and front frame ring 57 are formed from a glass filled nylon material that is molded into the desired shapes wherein this material has limited flexure so as to permit flexing of the various areas of the frame when placed under load by a chair occupant. Since the column halves 60 and 61 are separated from each other, these column halves 60 and 61 may articulate independently of each other to facilitate flexing and movement of the various frame corners 38 and 39. The upper ends of the frame halves 60 and 61 join integrally to the transverse arms 45, wherein the outer ends of the arms 45 extend outwardly and are molded integral with the vertical sides of the rear frame ring 56.
In the column base 59, this column base 59 terminates at a bottom wall 65 (
Further as to the bottom column wall 65 as seen in
As to the front frame ring 57 (
Turning next to the lumbar support unit 28, this unit is generally illustrated in
The carriage supports a resilient support arm 93 that effectively serves as a leaf spring so that the lumbar pad 91 may float rearwardly in response to movements of the occupant while generating a resistance or counterpressure to the pressure applied by the chair occupant and the pad movement caused thereby. Further, the support arm 93 provides asymmetric support to the lumbar pad 91 such that one-half of the lumbar pad 91 may apply a lower counterpressure and displace more easily rearwardly in response to the occupant as compared to the other half of the lumbar pad 91 which may provide firmer support. Thus, the pad 91 provides adjustable counter-pressure or resistance to movement even without mechanical translation or displacement of the pad 91 by the occupant. The asymmetric support of the lumbar pad 91 is adjustable by a pair of adjustment cranks 94 and 95 (
More particularly, the pad 91 comprises a central mounting section 101 which is horizontally elongate and offset rearwardly relative to the front pad face 102. The mounting section 101 has a back wall 103 in which is formed a pair of suspension slots 104 as seen in
While it is known to provide a lumbar pad which has a continuous solid construction, the pad 91 of the invention is defined by a plurality of concentric support rings 106-109 which generally extend parallel to each other but are radially spaced apart from each other and are offset in the front-to-back direction. Each adjacent pair of rings is joined together by molded connector webs 111-114.
The innermost support ring 106 is joined at two locations by the webs 111 to the opposite ends of the mounting section 101 such that the vertical sections of this support ring 106 are joined to the mounting section 101 while the remaining horizontal ring sections are completely separated from the mounting section 101.
Since the rings 106-109 and webs 111-114 are all molded together as a one-piece construction, relative counter-pressure, or if displaced by the occupant, relative movement of one ring relative to the other is still permitted due to the deformability of the mold material from which the lumbar pad 91 is formed. These concentric rings 106-109 are separated from each other along most of their peripheral length so as to provide varying amounts of predesigned pressure distribution to the occupant's back and allow for greater changes to the contour of the pad face 102 when pressed rearwardly by the back of the chair occupant. In use, the forward most outer ring 109 would first contact an occupant and when pressed rearwardly by the occupant the next successive ring 108 would support the occupant. Thus, the rings 106-109 would successively become effective to support the occupant's back.
The outer three support rings 107-109 are joined one with the other by the webs 112-114. In the upper half of the pad 91, the connector webs 112-114 are located in the upper left and right corners 116. However, in the region of the lower corners 117, no such webs are provided. Rather, the additional webs 119-121 are aligned more centrally within the pad 91 and angled downwardly and outwardly. As such, the specific lumbar configuration illustrated provides more support to the occupant's back in the region of the upper corners 116 since the webs 112-114 cause these upper corner portions 116 to have somewhat greater stiffness than the top portion of the pad 91 located between these corners 116. In this middle area, the horizontal sections of the rings 106-109 are completely separated from each other and have greater relative flexibility.
In the region of the lower corners 117, however, no webs are provided such that these lower corner portions 117 are more flexible with the lower half of the pad 91 being somewhat stiffer in the region of the webs 119-121. By selective placement of the webs 111-114 and 119-121, the response characteristics of the lumbar pad 91 may be selectively designed to vary the pressure distribution in response to any deformation of the lumbar pad 91 caused by contact with the occupant. Further, the performance characteristics can be varied depending upon the height, width, placement and number of webs 111-114 and 119-121.
With respect to
In addition to the foregoing, it is noted that each of the rings 106-109 has a rearwardly curved portion in the region of the vertical center line of the lumbar pad 91 so as to form a central groove 123 (
It will be understood that while the various connector webs 111-114 and 119-121 are generally diagonally aligned, it is possible to provide additional webs in the regions between these locations and that the webs also could be provided in alternate positions, such as staggered from each other, to provide alternative response characteristics to the lumbar pad 91.
Also, the inner support rings 106-108 are formed as endless loops. The outermost ring 109 is substantially similar except that a central portion on the bottom of the lumber pad 91 is omitted. Specifically, the region of the outer ring 109 between the webs 121 is not provided so that the lumber pad 91 has a space or notch 124 (
Turning next to the adjustment assembly 90, this assembly 90 includes the upright support bracket 97. This support bracket 97 as seen in
Further as to the support bracket 97, this bracket 97 includes a front wall 129 that is generally arcuate and has a pair of side wall sections 130 separated by a vertically elongate guide slot 131. This guide slot 131 cooperates with the aforementioned carriage 92 to guide vertical sliding thereof.
The wall sections 131 include a vertical row of teeth 132 which also cooperate with the carriage 92 to selectively hold the carriage 92 at a selected elevation while also permitting the carriage 92 to be moved vertically merely by having the occupant push on the carriage 92.
To permit sliding of the carriage 92, this carriage 92 includes a slide housing 135 which slidably engages the guide slot 131. The slide housing 135 includes a main wall 136, and a projecting guide portion 137 which is vertically elongate and is slidably received within the guide slot 131. This guide portion 137 includes a back wall 138 which projects partially out of the slot 127 as seen in
The slide housing 135 also includes a connector slot 146 (
Referring to this resilient support arm 93, this support arm 93 is formed of a resilient spring steel so that it is resiliently deflectable. The support arm 93 is formed of a cantilevered spring body 157 (
More particularly referring to
As seen in
As seen in
Since this spring plate 156 provides resilient support to the lumbar pad 91, this spring plate 156 thereby provides asymmetric support to this lumbar pad and allows the left and right halves of the lumbar pad 91 to have different performance characteristics. In particular, the left spring half 162, as illustrated, would provide greater resistance to displacement of the left half of the lumbar pad 91 while the right spring half 163 would provide less resistance to this rearward displacement of the right pad half. This resistance also could be equalized by aligning the fulcrum blocks 143 with each other.
To selectively adjust the vertical position of these fulcrum blocks 143, the adjustment cranks 94 and 95 are provided. These cranks 94 and 95 have a main shaft 168 on which a hand piece 169 is supported on the outer end thereof. The inner end of the main shaft 168 includes a drive gear 170 with gear teeth 171 that extend partially around the circumference as best seen in
The drive gears 170 engage the rack teeth 144 on the fulcrum blocks 143 so that rotation of these drive gears 170 causes vertical displacement of the blocks 143. While the main shafts 168 are supported on the common support axle 173, the shafts 168 are rotatable independently of each other so that each adjustment crank 94 or 95 may be independently rotated to adjust the position of one fulcrum block 143 completely independently of the other block 143 in accord with
In addition to the foregoing lumbar support unit 28, an additional pelvic support unit 29 is also provided as illustrated in
Also the plug portion 178 includes a locking recess 182 which opens rearwardly and essentially is defined by a blind bore. When the front and rear frame rings 56 and 57 are fixed together (
Since the pelvic support 175 is formed of a resiliently deflectable material such as plastic, the support arm 177 is able to bend forwardly during insertion or even for removal to permit the pocket post 75 to slide upwardly until it aligns with the corresponding locking recess 182, after which the support arm 177 returns to its undeflected condition with the post 75 seated within the recess 182. These cooperating components prevent vertical displacement of the pelvic support 175.
Since the resiliently deflectable suspension fabric 25 lies against the front face 183 (
The above-described discussion relates to the preferred lumbar support unit 28 and pelvic support unit 29. The lumbar pad 91 may also have an alternative configuration as illustrated in
More particularly, this alternative lumbar pad 200 is substantially similar to the lumbar pad 91 except for differences in the overall shape, web locations and the web construction.
More particularly, this lumbar pad 200 includes a central mounting section 201 which in this instance includes fastener holes 202 to allow for fixed attachment of this lumber pad 200 to an appropriate support arm that would have screw holes rather than the hooks 99. This particular lumbar pad 200 has an hourglass shape defined by larger outer ends and a narrower center area.
The pad 200 is defined by a plurality of concentric support rings 206-209 which are joined in radially separated relation by connector webs 211-214 and additional connector webs 219-221 and successively become effective or come into supporting contact with the occupant's back. As such, the outer ring 209 is effective first with the inner rings successively become effective as the occupant causes the rings to displace rearwardly. In this configuration, the innermost ring 206 is connected to the central section 201 by the pair of connector webs 211 that are formed substantially similar to the webs 111 described above. Additionally, the outer support rings 207-209 are supported by the connector webs 212-214, which webs 212-214 extend diagonally outwardly at the upper pad corners 216.
The pad 200 differs in that the connector webs 219-221 are located diagonally adjacent to each other at the lower corners 217 of the pad 200 which therefore provides response characteristics at the upper corners 216 and lower corners 217 that are substantially similar. This also provides greater flexibility in the spinal area of the bottom half of the pad 200 since the connector webs 219-221 are shifted farther outwardly as compared to the connector webs 119-121.
Further, the webs 212-214 and 219-221 differ in that they are formed as rearwardly curving shapes. Due to the resiliency of the mold material, these webs 212-214 function more as J-shaped springs as opposed to the flatter webs 112-114 and 119-121. This allows radially adjacent rings to move more independently of each other since there is more length to the webs 212-214 and 219-221 as compared to the flatter webs described above which therefore provides more resiliency.
Like the pad 91, this pad 200 also includes a central clearance groove 223 in the area of the spinal column to avoid contact with this part of the occupant's body.
With the above-described invention, an improved lumbar pad construction is provided. Additionally, an improved arrangement for supporting the lumbar pad is provided which provides for asymmetric performance by this lumbar pad and asymmetric support loads being provided thereto.
Although particular preferred embodiments of the invention have been disclosed in detail for illustrative purposes, it will be recognized that variations or modifications of the disclosed apparatus, including the rearrangement of parts, lie within the scope of the present invention.
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|U.S. Classification||297/284.3, 297/284.4|
|Cooperative Classification||A47C7/46, A47C7/462, A47C7/44|
|Jul 18, 2012||FPAY||Fee payment|
Year of fee payment: 4
|Apr 4, 2014||AS||Assignment|
Owner name: PNC BANK, NATIONAL ASSOCIATION, AS ADMINISTRATIVE
Free format text: COLLATERAL ASSIGNMENT OF PATENTS;ASSIGNOR:HAWORTH, INC., HAWORTH, LTD. AND SUCCESSORS;REEL/FRAME:032606/0875
Effective date: 20140403
|Jul 21, 2016||FPAY||Fee payment|
Year of fee payment: 8